We have the same question. We need to look at the option of federating with a cloud providor and cant seem to find anything like vcloud director. Unfortunately it would cost 700k in licensing us and cant justify it for a small 400 VM environment. I can use that money and buy our own hardware and install it in a colo. heck a fully loaded C7000 and a Netapp with 20 TB would cost me less.
We need the ability to easily move VMs in and out of our internal VMware virtual environment to the virtual inforasturture hosting providor as needed. One of our DCs is old and running out of space and want to see what our options are. We eventually want to leverage automation via some sort of service request portal as well but thats a year down the line.
We do not want to move away from VMware for our virtual infrastructure.
I would entertain any ideas or suggestions but I would love to see whats out there that offers simmilar functionality to vcloud director at least with the ability to automate and federate.
Come on guys, there's gotta be some VARs and Vendors trolling here 
Apoligies AB if I sem to be threadjacking but I think we more or less want the same thing.